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NORTECROEMCIOMNMTEENMRDESENIDLDEPRDAERPFTLOAIRSCLNE6EM2W7E7NDATEPSAIGRNTS
DATASHEET
Multiphase PWM Regulator for AMD Fusion™ Mobile
CPUs Using SVI 2.0
ISL6277
The ISL6277 is fully compliant with AMD Fusion™ SVI 2.0 and
provides a complete solution for microprocessor and graphics
processor core power. The ISL6277 controller supports two
Voltage Regulators (VRs) with three integrated gate drivers and
two optional external drivers for maximum flexibility. The Core VR
can be configured for 3-, 2-, or 1-phase operation while the
Northbridge VR supports 2- or 1-phase configurations. The two
VRs share a serial control bus to communicate with the AMD CPU
and achieve lower cost and smaller board area compared with
two-chip solutions.
The PWM modulator is based on Intersil’s Robust Ripple
Regulator R3 Technology™. Compared to traditional modulators,
the R3 modulator can automatically change switching frequency
for faster transient settling time during load transients and
improved light load efficiency.
The ISL6277 has several other key features. Both outputs
support DCR current sensing with single NTC thermistor for
DCR temperature compensation or accurate resistor current
sensing. Both outputs utilize remote voltage sense, adjustable
switching frequency, OC protection and power good.
Applications
• AMD Fusion CPU/GPU Core Power
• Notebook Computers
Features
• Supports AMD SVI 2.0 Serial Data Bus Interface
• Dual Output Controller with Integrated Drivers
- Two Dedicated Core Drivers
- One Programmable Driver for Either Core or Northbridge
• Precision Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- 0.5V to 1.55V in 6.25mV Steps
- Enhanced Load Line Accuracy
• Supports Multiple Current Sensing Methods
- Lossless Inductor DCR Current Sensing
- Precision Resistor Current Sensing
• Programmable 1-, 2- or 3-Phase for the Core Output and
1- or 2-Phase for the Northbridge Output
• Adaptive Body Diode Conduction Time Reduction
• Superior Noise Immunity and Transient Response
• Output Current Monitor and Thermal Monitor
• Differential Remote Voltage Sensing
• High Efficiency Across Entire Load Range
• Programmable Slew Rate
• Programmable VID Offset and Droop on Both Outputs
• Programmable Switching Frequency for Both Outputs
• Excellent Dynamic Current Balance Between Phases
• OCP/WOC, OVP, PGOOD, and Thermal Monitor
• Small Footprint 48 Ld 6x6 QFN Package
- Pb-Free (RoHS Compliant)
Core Performance
100
90
80
70
60
50
40
30
20
10
0
0
VIN = 12V
VIN = 19V
VIN = 8V
VOUT CORE = 1.1V
5 10 15 20 25 30 35 40 45 50 55
IOUT (A)
FIGURE 1. EFFICIENCY vs LOAD
1.12
1.10
1.08
1.06
1.04
1.02
VIN = 12V
VIN = 8V
1.00
VIN = 19V
0.98 VOUT CORE = 1.1V
0.96 0 5 10 15 20 25 30 35 40 45 50 55
IOUT (A)
FIGURE 2. VOUT vs LOAD
March 8, 2012
FN8270.1
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) and R3 Technology are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.

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ISL6277
Simplified Application Circuit for High Power CPU Core
NB_PH1
NB_PH2
VNB1
VNB2
NB_PH1
NB_PH2
VNB_SENSE
VCORE_SENSE
PH1
PH2
PH3
VO1
VO2
VO3
Ri
Cn
NTC
ISEN1_NB
ISEN2_NB
ISUMN_NB
ISUMP_NB
BOOTX
UGATEX
PHASEX
LGATEX
FCCM_NB
VIN
NB_PH1
VIN
VNB1
VNB
PWM2_NB
COMP_NB
FB_NB
VSEN_NB
PWROK
SVT
µP SVD
SVC
VDDIO
IMON_NB
NTC_NB
VR_HOT_L
IMON
NTC
PWM_Y
COMP
FB2
FB
VSEN
RTN
ISEN1
ISEN2
ISEN3
Ri
Cn
NTC
ISUMN
ISUMP
ISL6277
BOOT2
UGATE2
PHASE2
LGATE2
BOOT1
UGATE1
PHASE1
LGATE1
NB_PH2
THERMAL INDICATOR
VIN
PH3
VIN
PH2
VIN
PH1
VNB2
VO3
VCORE
VO2
VO1
FIGURE 3. TYPICAL APPLICATION CIRCUIT USING INDUCTOR DCR SENSING
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ISL6277
Simplified Application Circuit with 3 Internal Drivers Used for Core
VIN
NB_PH1
NB_PH2
VNB1
VNB2
NB_PH1
NB_PH2
VNB_SENSE
VCORE_SENSE
PH1
PH2
PH3
VO1
VO2
VO3
Ri
Cn NTC
ISEN1_NB
ISEN2_NB
ISUMN_NB
ISUMP_NB
PWM_Y
FCCM_NB
PWM2_NB
µP
Ri
Cn
NTC
COMP_NB
FB_NB
VSEN_NB
PWROK
SVT
SVD
SVC
VDDIO
IMON_NB
NTC_NB
VR_HOT_L
IMON
NTC
BOOTX
UGATEX
PHASEX
COMP
FB2
FB
VSEN
RTN
ISEN1
ISEN2
ISEN3
ISUMN
ISUMP
ISL6277
LGATEX
BOOT2
UGATE2
PHASE2
LGATE2
BOOT1
UGATE1
PHASE1
LGATE1
NB_PH1
VIN
NB_PH2
THERMAL INDICATOR
VIN
PH3
VIN
PH2
VIN
PH1
VNB
VNB1
VNB2
V03
VCORE
VO2
VO1
FIGURE 4. TYPICAL APPLICATION CIRCUIT USING INDUCTOR DCR SENSING
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ISL6277
Simplified Application Circuit for Mid-Power CPUs [2+1 Configuration]
* Resistor required or ISEN1_NB
will pull HIGH if left open and
disable Channel 1.
10kΩ*
NBN
NBP
+5V
Ri
NTC
Cn
ISEN1_NB
ISEN2_NB
ISUMN_NB
ISUMP_NB
PWM_Y
FCCM_NB
PWM2_NB OPEN
VIN
VNB
NBP NBN
VNB_SENSE
VCORE_SENSE
VP1
VP2
VN1
VN2
µP
+5V
Ri
Cn
NTC
COMP_NB
FB_NB
IMON_NB
NTC_NB
VSEN_NB
PWROK
SVT
SVD
SVC
VDDIO
BOOTX
UGATEX
PHASEX
LGATEX
OPEN
OPEN
OPEN
OPEN
VR_HOT_L
IMON
Thermal Indicator
COMP
ISL6277
NTC
FB2
FB
VSEN
RTN
ISEN1
ISEN2
ISEN3
BOOT2
UGATE2
PHASE2
LGATE2
BOOT1
ISUMN
UGATE1
PHASE1
VIN
VP2 VN2
VIN
ISUMP
LGATE1
VP1 VN1
VCORE
FIGURE 5. TYPICAL APPLICATION CIRCUIT USING RESISTOR SENSING
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ISL6277
Simplified Application Circuit for Low Power CPUs [1+1 Configuration]
* Resistor required or ISEN1_NB
will pull HIGH if left open and
disable Channel 1.
10kΩ*
VNB1
NB_PH1
+5V
Ri
NTC
Cn
ISEN1_NB
ISEN2_NB
ISUMN_NB
ISUMP_NB
BOOTX
UGATEX
PHASEX
LGATEX
FCCM_NB
VIN
NB_PH1
VNB
VNB1
COMP_NB
PWM2_NB OPEN
VNB_SENSE
µP
* Resistor required or ISEN1_NB
will pull HIGH if left open and
disable Channel 1.
10kΩ*
+5V
+5V
FB_NB
VSEN_NB
PWROK
SVT
SVD
SVC
VDDIO
ISEN1
ISEN2
ISEN3
VCORE_SENSE
COMP
OPEN
FB2
FB
VSEN
RTN
VO1
PH1
Ri
NTC
Cn
ISUMN
ISUMP
ISL6277
IMON_NB
NTC_NB
VR_HOT
NTC
IMON
THERMAL INDICATOR
PWM_Y OPEN
BOOT2 OPEN
UGATE2
PHASE2
OPEN
OPEN
LGATE2 OPEN
BOOT1
UGATE1
PHASE1
LGATE1
VIN
PH1
VCORE
VO1
FIGURE 6. TYPICAL APPLICATION CIRCUIT USING INDUCTOR DCR SENSING
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